英制／公制型             数显型

 测量范围            货号            精度            备注 
                 573-242-20                  刀刃型，可测量最小孔径： 
 .4 " - 8"                     ±.002"                              o.4 " 
                 573-245-20                  内凹槽型，可测量最小孔径： 
 .4 " - 6"                     ±.002"                                o.4 " 
                 573-246-20                  尖爪型，可测量最小孔径： 
 .8" - 6"                      ±.0015"                             o.8"